Question

what is power of lens? what is s.i. unit ? name the type of lens whose power is positive

Answer 1

Ability of a lens to converge/diverge a beam of light rays is expressed in term of its power. it's SI unit is Dioptre. Convex lens has positive power.

Answer 2

The power can be defined as the ability of the lens to bend the rays of light.

Explanation:

• The SI unit of lens is diopter, it is denoted by ''D''.  
• The power of the convex lens is positive. A convex lens has the ability to converge the rays of light towards the principle axis.
• This way the lens bends the rays of light.
• The lens of short focal length bends the light more thus the power of the lens increases.
• Thus the power of the lens is the reciprocal of the focal length (f) in meters.

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